Wow! Sounds like a great trip! Last Oct/Nov my dh and I plus our three dds who were 11,8 and 23 months at the time, did our first WDW trip. It was awesome! We were also very nervous about our almost 2 year old, but she was amazing! She actually handled the time difference better than the rest of us!
It's hard to be excited when you have people telling you, "you're crazy" for taking a 2 year old half way across the world. But, as you said, losfp - you can't put your life on hold. I definitely agree with this! Especially with two older kids, we can't stop everything until the youngest gets bigger. And now I can say "I did it! I took a 2 year old to the U.S. and we all survived!"lol!